Textile core with a breakaway stringup slot

ABSTRACT

A laminated textile yarn core with a breakaway stringup slot features a circumferentially disposed groove in the outer surface of the core for initiating stringup and a second circumferentially disposed groove on the inside that is longitudinally inward from the stringup groove. The two grooves have overlapping depths to cut one common bond line between layers of the core. The incorporation of the second groove permits removal of the section of the core between the stringup slot and the end of the core by shearing the ply bond layer between the stringup slot and inner groove.

United States Patent [1 1 Sowell TEXTILE CORE WITH A BREAKAWAY STRINGUPSLOT [75] Inventor: Lyles Howard Sowell, Madison,

Tenn.

[73] Assignee: EJ. du Pont de Nemous and Company, Wilmington, Del.

[22] Filed: Oct. 16, 1972 [21] Appl. No.: 297,806

[52] US. Cl 242/l25.l, 242/18 PW, 242/165 [51] Int. Cl. B651! 75/28 [58]Field of Search..... 242/125.1, 125.2, 125, 118,242/1183,1l8.31,118.32,18 PW, 18 EW, 165,57/34 TT; 138/100, 101, 102

[56] References Cited UNITED STATES PATENTS 3,103,305 9/1963 Heatherly'242/125.1 UX

[451 Feb. 26, 1974 3,284,023 11/1966 Sowe11 ..242/125.l 3,285,530ll/1966 Kirchner et al.'. 242/125.1

Primary Examiner-George F. Mautz 57 0 ABSTRACT A laminated textile yarncore with a breakaway stringup slot features a circumferentiallydisposed groove in the outer surface of the core for initiating stringupand a second Circumferentially disposed groove on the inside that islongitudinally inward from the stringup groove. The two grooves haveoverlapping depths to cut one common bond line between layers of thecore. The incorporation of the second groove permits removal of thesection of the core between the stringup slot and the end of the core byshearing the ply bond layer between the stringup slot and inner groove.

5 Claims, 4 Drawing Figures TEXTILE CORE WITI-I A BREAKAWAY STRINGUPSLOT BACKGROUND OF THE INVENTION I 'cores made of laminate paper bymeans of which the yarn securely attached to the core end at the startupof winding is easily released prior to the initiation of an unwindingoperation. l

Modern high speed production methods entail efficient processes in boththe initial winding and in the unwinding of textile yarns from packagesduring subsequent processing. Of particular usefulness in the initialwinding operation have been textile. cores of the types disclosed inSowell, U. S. Pat. No. 3,284,023 and in Heatherly, U. S. Pat. No.3,103,305 which use traps and/or a circumferential V-groove in the coreend to effect the initial engagement of the yarn therewith. Yarn placedin position to enter the groove during yarn stringup is engaged by thegroove or trap and is quickly severed, the initial windings thenforminga transfer tail for use in subsequent processing. Two problems may ariseduring removal ofyarn from these cores which are l the time required toget the tail free from the trap or groove may be excessive, and (2) theyarn may catch contour of the groove '13 cut into, the inner surface ofthe core comprises a narrow portion only. Inan alternate embodimentshown in FIGS. 2, 3 and 4 a hole 18 is provided through one end of thecore outboard of the grooves. The axis of hole 18 intersects at 90 therotational axis A-A of the core.

The core is fabricated from spirally wound paper or paperboard sheetsusing an adhesive to bond the paper plies 20 at glue lines 22 as shownin FIG. 3. The grooves l2, 13 are cut into the surfaces of the core in aplane perpendicular to the axis of the core, are thus parallel to eachother and separated by the distance x, and are generally ofsimilar'depth, the depths being such that they cut at least one commonglue line 24 between plies. ,The core may then be sheared along thisglue line at the desired time. I

The distance x between grooves is selected so that the core hassufficient strength for performing its stringup and winding functions,but also so that the end may be sheared and removed when desired bytwisting, pressing, pulling, or by the preferred means of wedging,usinga suitable tool in conjunction with the hole 18. Removal of thecore end frees the transfer tail for easy tie-in in a continuousunwinding operation and. eliminates the groove 12 which can catch orsnag theyarn during yarn transfer. It has been found that the usefulrangefor dimension'.\- for a core with a 2 inch inner diameter and witha wall thickness'of 5/32 inch should not be less than 0.030 inch tomaintain the structural integrity of the core wall, and for ease ofremoval,

in the groove during unwinding. The cores of this invention eliminatebothof these problems.

SUMMARY OF THE INVENTION layers of the laminate.

BRIEF :DESCRIPTIONQF THE DRAWING FIG. 1 is a cross-sectional'view of aportion of a core constructed in accordance with the invention.

FIG. 2 is an isometric view of an alternate embodiment of the invention.

FIG. 3 is a cross-sectional view through 33 of FIG. 2.

FIG. 4 is a side view of a being removed. I

DETAILED PE$CRIPTION or "rat-2 ILLUSTRATED EMBODIMENT As illustrated inFIGS. 1 and 2, core 10 isa hollow cylindrical body containing grooves 12and 13 placed near core end 14. Groove 12 is located in the outersurface I5 ofthe tube and groove 13 is located in the inner surface 16of the tube. Groove 13 is located longitudinally inward of groove 12 bya distance .r.

The contour of the groove 12 encircling the outer surface of the core isgenerally V-shaped and of the type disclosed in Heatherly. US. Pat. No.3,103,305 comprising a wide portion and a narrow portion. The

core showing the core end should not exceed 0.250 inch. Dimension willvary depending-on the strength of the glue/paper bond and with thepossible glued area between grooves which is related directly to thediameter of the core.

The preferred means for removing the core end is by prying with a toolcomprised ofa handle 26 and a blade 28 with an end contoured to fit hole18. The end of the blade is inserted into the hole from'the-inside ofthe tube and pivoted across the opposite edge of the tube as indicatedin FIG. 4. The end, sheared along a glue line, comes'cleanly away fromthat core section carrying the yarn package, leaving no groove or endroughness to snag an unwinding threadline.

What is claimed is:

l. A laminated yarn core comprising superposed bonded layers and havingouter and inner surfaces, said core having a circumferential stringupgroove in its' outer surface located adjacent one of its ends to effectthe initial engagement of the yarn on the core, said core also having acircumferential groove in its inner surface located longitudinallyinward from said stringup groove, said grooves being of such a depth asto cut one common bond line between said layers.

2. The yarn core of claim 1, said core being provided with a throughhole in said one end longitudinally outward from said stringup groove.

3. The yarn core of claim 1, said layers being paper.

4. .The yarn core of claim 1, said yarn core having a diameter of about2 inches,'thegroove on t'heinne'r surface being located longitudinallyinward from the stringup groove a distance of. from'about 0.030 inch toone common adhesive line between said layers.

1. A laminated yarn core comprising superposed bonded layers and havingouter and inner surfaces, said core having a circumferential stringupgroove in its outer surface located adjacent one of its ends to effectthe initial engagement of the yarn on the core, said core also having acircumferential groove in its inner surface located longitudinallyinward from said stringup groove, said grooves being of such a depth asto cut one common bond line between said layers.
 2. The yarn core ofclaim 1, said core being provided with a through hole in said one endlongitudinally outward from said stringup groove.
 3. The yarn core ofclaim 1, said layers being paper.
 4. The yarn core of claim 1, said yarncore having a diameter of about 2 inches, the groove on the innersurface being located longitudinally inward from the stringup groove adistance of from about 0.030 inch to about 0.250 inch.
 5. A hollowcylindrical textile yarn core comprising superposed layers of paperbonded by an adhesive and having outer and inner surfaces, said corehaving a circumferential stringup groove in its outer surface locatedadjacent one of its ends to effect initial engagement of the yarn on thecore, said core also having a circumferential groove in its innersurface located longitudinally inward from said stringup groove, saidgrooves being of such depth as to overlap and to cut one common adhesiveline between said layers.